The Testament of Sister New Devil (Seasons 1–2)

The Testament of Sister New Devil (新妹魔王の契約者, 2015) is a Japanese fantasy-comedy anime series with action and ecchi elements you can watch online on iFILM, voiced by Yuichi Nakamura in the lead role.

High schooler Basara Toujou expected ordinary stepsisters. Instead, his father brings home Mio, the new Demon Lord, and Maria, a succubus. A botched pact flips the power dynamic — Basara ends up as their master rather than the other way around. What follows mixes slapstick awkward situations with genuine supernatural threats from rival demon clans gunning for Mio. Stream The Testament of Sister New Devil (2015) online on iFILM.